msdos/int13.c

   1 /*
   2  * BIOS interrupt 13h handler
   3  */
   4
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <sys/ioctl.h>
  10 #include <fcntl.h>
  11 #ifdef linux
  12 #include <linux/fd.h>
  13 #endif
  14 #include "miscemu.h"
  15 /* #define DEBUG_INT */
  16 #include "debug.h"
  17 #include "drive.h"
  18
  19 /**********************************************************************
  20  *          INT_Int13Handler
  21  *
  22  * Handler for int 13h (disk I/O).
  23  */
  24 void WINAPI INT_Int13Handler( CONTEXT *context )
  25 {
  26     switch(AH_reg(context))
  27     {
  28         case 0x00:                            /* RESET DISK SYSTEM     */
  29         case 0x04:                            /* VERIFY DISK SECTOR(S) */
  30                 AH_reg(context) = 0;
  31                 break;
  32
  33         case 0x05:                                     /* FORMAT TRACK */
  34         case 0x06:             /* FORMAT TRACK AND SET BAD SECTOR FLAGS */
  35         case 0x07:             /* FORMAT DRIVE STARTING AT GIVEN TRACK  */
  36             /* despite what Ralf Brown says, 0x06 and 0x07 seem to
  37              * set CFLAG, too (at least my BIOS does that) */
  38             AH_reg(context) = 0x0c;
  39             SET_CFLAG(context);
  40             break;
  41
  42         case 0x08:                              /* GET DRIVE PARAMETERS  */
  43                 if (DL_reg(context) & 0x80) { /* hard disk ? */
  44                         AH_reg(context) = 0x07;
  45                         SET_CFLAG(context);
  46                 }
  47                 else { /* floppy disk */
  48 #ifdef linux
  49                         unsigned int i, nr_of_drives = 0;
  50                         BYTE drive_nr = DL_reg(context);
  51                         int floppy_fd;
  52                         struct floppy_drive_params floppy_parm;
  53
  54                         AH_reg(context) = 0x00; /* success */
  55
  56                         for (i = 0; i < MAX_DOS_DRIVES; i++)
  57                         if (DRIVE_GetType(i) == TYPE_FLOPPY) nr_of_drives++;
  58                         DL_reg(context) = nr_of_drives;
  59
  60                         if (drive_nr > 1) { /* invalid drive ? */
  61                                 BX_reg(context) = 0;
  62                                 CX_reg(context) = 0;
  63                                 DH_reg(context) = 0;
  64                                 break;
  65                         }
  66
  67                         if ( (floppy_fd = DRIVE_OpenDevice( drive_nr, O_NONBLOCK)) == -1)
  68                         {
  69                                 WARN(int, "(GET DRIVE PARAMETERS): Can't determine floppy geometry !\n");
  70                                 BX_reg(context) = 0;
  71                                 CX_reg(context) = 0;
  72                                 DH_reg(context) = 0;
  73                                 break;
  74                         }
  75                         ioctl(floppy_fd, FDGETDRVPRM, &floppy_parm);
  76                         close(floppy_fd);
  77
  78                         BL_reg(context) = floppy_parm.cmos;
  79
  80                         /* CH = low eight bits of max cyl
  81                            CL = max sec nr (bits 5-0),
  82                            hi two bits of max cyl (bits 7-6)
  83                            DH = max head nr */
  84                         DH_reg(context) = 0x01;
  85                         switch (BL_reg(context))
  86                         {
  87                             case 0: /* no drive */
  88                                 CX_reg(context) = 0x0;
  89                                 DX_reg(context) = 0x0;
  90                                 break;
  91                             case 1: /* 360 K */
  92                                 CX_reg(context) = 0x2709;
  93                                 break;
  94                             case 2: /* 1.2 M */
  95                                 CX_reg(context) = 0x4f0f;
  96                                 break;
  97                             case 3: /* 720 K */
  98                                 CX_reg(context) = 0x4f09;
  99                                 break;
 100                             case 4: /* 1.44 M */
 101                                 CX_reg(context) = 0x4f12;
 102                                 break;
 103                             case 5:
 104                             case 6: /* 2.88 M */
 105                                 CX_reg(context) = 0x4f24;
 106                                 break;
 107                         }
 108                         ES_reg(context) = 0x0000; /* FIXME: drive parameter table */
 109                         DI_reg(context) = 0x0000;
 110 #else
 111                         AH_reg(context) = 0x01;
 112                         SET_CFLAG(context);
 113                         break;
 114 #endif
 115                 }
 116                 break;
 117
 118         case 0x09:         /* INITIALIZE CONTROLLER WITH DRIVE PARAMETERS */
 119         case 0x0c:         /* SEEK TO CYLINDER                            */
 120         case 0x0d:         /* RESET HARD DISKS                            */
 121         case 0x10:         /* CHECK IF DRIVE READY                        */
 122         case 0x11:         /* RECALIBRATE DRIVE                           */
 123         case 0x14:         /* CONTROLLER INTERNAL DIAGNOSTIC              */
 124                 AH_reg(context) = 0;
 125                 break;
 126
 127         case 0x0e:                    /* READ SECTOR BUFFER (XT only)      */
 128         case 0x0f:                    /* WRITE SECTOR BUFFER (XT only)     */
 129         case 0x12:                    /* CONTROLLER RAM DIAGNOSTIC (XT,PS) */
 130         case 0x13:                    /* DRIVE DIAGNOSTIC (XT,PS)          */
 131                 AH_reg(context) = 0x01;
 132                 SET_CFLAG(context);
 133                 break;
 134
 135         case 0x17:         /* SET DISK TYPE FOR FORMAT */
 136                 if (DL_reg(context) < 4)
 137                     AH_reg(context) = 0x00; /* successful completion */
 138                 else
 139                     AH_reg(context) = 0x01; /* error */
 140                 break;
 141         case 0x18:
 142                 if (DL_reg(context) < 4)
 143                     AH_reg(context) = 0x00; /* successful completion */
 144                 else
 145                     AH_reg(context) = 0x01; /* error */
 146                 break;
 147         default:
 148                 INT_BARF( context, 0x13 );
 149     }
 150 }